Better zooming in/out in 2up.  WIP
Better zooming in/out in 2up.  WIP

garyrh/bookreader,Islandora/internet_archive_bookreader,brisandbeans/bookreader,gootdude/bookreader,internetarchive/bookreader,Islandora/internet_archive_bookreader,brisandbeans/bookreader,openlibrary/bookreader,gootdude/bookreader,gootdude/bookreader,Islandora/internet_archive_bookreader,openlibrary/bookreader,Islandora/internet_archive_bookreader,nikolas/bookreader,openlibrary/bookreader,niksu/bookreader,yankl/bookreader,niksu/bookreader,internetarchive/bookreader,yankl/bookreader,openlibrary/bookreader,brisandbeans/bookreader,niksu/bookreader,Islandora/internet_archive_bookreader,yankl/bookreader,yankl/bookreader,yankl/bookreader,niksu/bookreader,niksu/bookreader,brisandbeans/bookreader,garyrh/bookreader,gootdude/bookreader,garyrh/bookreader,openlibrary/bookreader,nikolas/bookreader,brisandbeans/bookreader,garyrh/bookreader,garyrh/bookreader